Review of the JET ILA scattering-matrix arc detection system

P. Dumortier; E. Lerche; F. Durodié; T. Blackman; W. Helou; I. Monakhov; C. Noble

doi:10.1016/j.fusengdes.2019.01.085

Review of the JET ILA scattering-matrix arc detection system

P. Dumortier
, E. Lerche
, F. Durodié
, T. Blackman
, W. Helou
, I. Monakhov
, C. Noble

Laboratory for Plasma Physics

Culham Centre for Fusion Energy
Commissariat à l'Énergie Atomique (CEA)

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Arc detection is an essential protection system for high power RF systems. It is commonly realised by monitoring the Voltage Standing Wave Ratio (VSWR) in the transmission lines. The JET ILA is a load-tolerant ICRF antenna with a low impedance section, for which the standard VSWR protection is ineffective. The Scattering-Matrix Arc Detection (SMAD) was proposed and implemented on JET to protect the low-impedance section around the T-junction against arcing. It is based on a consistency check of the RF signals around this section using a table of coefficients obtained from RF modelling. The paper reviews the SMAD principle, its commissioning on JET and the latest improvements to the system. It shows an example of operation and the time response of the system is analysed. The latest improvements have increased the robustness and reliability of SMAD, making it a choice of arc detection system for critical sections on existing and future RF systems.

Original language	English
Article number	110669
Journal	Fusion Engineering and Design
Volume	150
DOIs	https://doi.org/10.1016/j.fusengdes.2019.01.085
Publication status	Published - Jan 2020

Keywords

Arc detection
ICRF
ICRH
ILA
JET
SMAD

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10.1016/j.fusengdes.2019.01.085

Cite this

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title = "Review of the JET ILA scattering-matrix arc detection system",

abstract = "Arc detection is an essential protection system for high power RF systems. It is commonly realised by monitoring the Voltage Standing Wave Ratio (VSWR) in the transmission lines. The JET ILA is a load-tolerant ICRF antenna with a low impedance section, for which the standard VSWR protection is ineffective. The Scattering-Matrix Arc Detection (SMAD) was proposed and implemented on JET to protect the low-impedance section around the T-junction against arcing. It is based on a consistency check of the RF signals around this section using a table of coefficients obtained from RF modelling. The paper reviews the SMAD principle, its commissioning on JET and the latest improvements to the system. It shows an example of operation and the time response of the system is analysed. The latest improvements have increased the robustness and reliability of SMAD, making it a choice of arc detection system for critical sections on existing and future RF systems.",

keywords = "Arc detection, ICRF, ICRH, ILA, JET, SMAD",

author = "P. Dumortier and E. Lerche and F. Durodi{\'e} and T. Blackman and W. Helou and I. Monakhov and C. Noble",

note = "Publisher Copyright: {\textcopyright} 2019 EURATOM",

year = "2020",

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doi = "10.1016/j.fusengdes.2019.01.085",

language = "English",

volume = "150",

journal = "Fusion Engineering and Design",

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AU - Dumortier, P.

AU - Lerche, E.

AU - Durodié, F.

AU - Blackman, T.

AU - Helou, W.

AU - Monakhov, I.

AU - Noble, C.

PY - 2020/1

Y1 - 2020/1

N2 - Arc detection is an essential protection system for high power RF systems. It is commonly realised by monitoring the Voltage Standing Wave Ratio (VSWR) in the transmission lines. The JET ILA is a load-tolerant ICRF antenna with a low impedance section, for which the standard VSWR protection is ineffective. The Scattering-Matrix Arc Detection (SMAD) was proposed and implemented on JET to protect the low-impedance section around the T-junction against arcing. It is based on a consistency check of the RF signals around this section using a table of coefficients obtained from RF modelling. The paper reviews the SMAD principle, its commissioning on JET and the latest improvements to the system. It shows an example of operation and the time response of the system is analysed. The latest improvements have increased the robustness and reliability of SMAD, making it a choice of arc detection system for critical sections on existing and future RF systems.

AB - Arc detection is an essential protection system for high power RF systems. It is commonly realised by monitoring the Voltage Standing Wave Ratio (VSWR) in the transmission lines. The JET ILA is a load-tolerant ICRF antenna with a low impedance section, for which the standard VSWR protection is ineffective. The Scattering-Matrix Arc Detection (SMAD) was proposed and implemented on JET to protect the low-impedance section around the T-junction against arcing. It is based on a consistency check of the RF signals around this section using a table of coefficients obtained from RF modelling. The paper reviews the SMAD principle, its commissioning on JET and the latest improvements to the system. It shows an example of operation and the time response of the system is analysed. The latest improvements have increased the robustness and reliability of SMAD, making it a choice of arc detection system for critical sections on existing and future RF systems.

KW - Arc detection

KW - ICRF

KW - ICRH

KW - ILA

KW - JET

KW - SMAD

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DO - 10.1016/j.fusengdes.2019.01.085

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VL - 150

JO - Fusion Engineering and Design

JF - Fusion Engineering and Design

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ER -

Review of the JET ILA scattering-matrix arc detection system

Abstract

Keywords

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